Partial loop unrolling with switch and do while

Champerty and maintenance are doctrines in common law jurisdictions that aim to preclude frivolous litigation.

Calculate the angle between two vectors using ArcCos or Diamond Angle

$\vec{A}\times\vec{B} = \|\vec{A}\|\times\|\vec{B}\|\times\sin\theta\times\widehat{\vec{N}}$
Where $\vec{N}$ is perpendicular to the $\vec{A}$, $\vec{B}$ plane.

$\vec{A}\cdot\vec{B} = \|\vec{A}\|\times\|\vec{B}\|\times\cos\theta$
$\vec{A}[x_{_1}, y_{_1}]\cdot …$

This will calculate the clockwise or anti-clockwise angle (depending on coordinate system chirality) of a vector in a range of $0$ to $4$ where each whole unit is equal to $90\degree$.